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//==========================================================================
//
// net/enet.c
//
// Stand-alone ethernet [link-layer] support for RedBoot
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-07-14
// Purpose:
// Description:
//
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <redboot.h>
#include <net/net.h>
#include <cyg/io/eth/eth_drv.h> // Logical driver interfaces
//#define ENET_STATS 1
#ifdef ENET_STATS
static int num_ip = 0;
static int num_arp = 0;
#ifdef NET_SUPPORT_RARP
static int num_rarp = 0;
#endif
static int num_received = 0;
static int num_transmitted = 0;
#endif
//
// Support for user handlers of additional ethernet packets (nonIP)
//
#define NUM_EXTRA_HANDLERS 4
static struct {
int type;
pkt_handler_t handler;
} eth_handlers[NUM_EXTRA_HANDLERS];
pkt_handler_t
__eth_install_listener(int eth_type, pkt_handler_t handler)
{
int i, empty;
pkt_handler_t old;
if (eth_type > 0x800 || handler != (pkt_handler_t)0) {
empty = -1;
for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
if (eth_handlers[i].type == eth_type) {
// Replace existing handler
old = eth_handlers[i].handler;
eth_handlers[i].handler = handler;
return old;
}
if (eth_handlers[i].type == 0) {
empty = i;
}
}
if (empty >= 0) {
// Found a free slot
eth_handlers[empty].type = eth_type;
eth_handlers[empty].handler = handler;
return (pkt_handler_t)0;
}
}
diag_printf("** Warning: can't install listener for ethernet type 0x%02x\n", eth_type);
return (pkt_handler_t)0;
}
void
__eth_remove_listener(int eth_type)
{
int i;
for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
if (eth_handlers[i].type == eth_type) {
eth_handlers[i].type = 0;
}
}
}
/*
* Non-blocking poll of ethernet link. Process packets until no more
* are available.
*/
void
__enet_poll(void)
{
pktbuf_t *pkt;
eth_header_t eth_hdr;
int i, type;
#ifdef DEBUG_PKT_EXHAUSTION
static bool was_exhausted = false;
#endif
while (true) {
/*
* Try to get a free pktbuf and return if none
* are available.
*/
if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) {
#ifdef DEBUG_PKT_EXHAUSTION
if (!was_exhausted) {
int old = start_console(); // Force output to standard port
diag_printf("__enet_poll: no more buffers\n");
__pktbuf_dump();
was_exhausted = true;
end_console(old);
}
#endif
return;
}
#ifdef DEBUG_PKT_EXHAUSTION
was_exhausted = false; // Report the next time we're out of buffers
#endif
if ((pkt->pkt_bytes = eth_drv_read((char *)ð_hdr, (char *)pkt->buf,
ETH_MAX_PKTLEN)) > 0) {
#ifdef ENET_STATS
++num_received;
#endif
switch (type = ntohs(eth_hdr.type)) {
case ETH_TYPE_IP:
#ifdef ENET_STATS
++num_ip;
#endif
pkt->ip_hdr = (ip_header_t *)pkt->buf;
__ip_handler(pkt, ð_hdr.source);
break;
case ETH_TYPE_ARP:
#ifdef ENET_STATS
++num_arp;
#endif
pkt->arp_hdr = (arp_header_t *)pkt->buf;
__arp_handler(pkt);
break;
#ifdef NET_SUPPORT_RARP
case ETH_TYPE_RARP:
#ifdef ENET_STATS
++num_rarp;
#endif
pkt->arp_hdr = (arp_header_t *)pkt->buf;
__rarp_handler(pkt);
break;
#endif
default:
if (type > 0x800) {
for (i = 0; i < NUM_EXTRA_HANDLERS; i++) {
if (eth_handlers[i].type == type) {
(eth_handlers[i].handler)(pkt, ð_hdr);
}
}
}
__pktbuf_free(pkt);
break;
}
} else {
__pktbuf_free(pkt);
break;
}
}
}
/*
* Send an ethernet packet.
*/
void
__enet_send(pktbuf_t *pkt, enet_addr_t *dest, int eth_type)
{
eth_header_t eth_hdr;
// Set up ethernet header
memcpy(ð_hdr.destination, dest, sizeof(enet_addr_t));
memcpy(ð_hdr.source, __local_enet_addr, sizeof(enet_addr_t));
eth_hdr.type = htons(eth_type);
eth_drv_write((char *)ð_hdr, (char *)pkt->buf, pkt->pkt_bytes);
#ifdef ENET_STATS
++num_transmitted;
#endif
}
#ifdef __LITTLE_ENDIAN__
unsigned long
ntohl(unsigned long x)
{
return (((x & 0x000000FF) << 24) |
((x & 0x0000FF00) << 8) |
((x & 0x00FF0000) >> 8) |
((x & 0xFF000000) >> 24));
}
unsigned short
ntohs(unsigned short x)
{
return (((x & 0x00FF) << 8) |
((x & 0xFF00) >> 8));
}
#endif
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